Collection Cups function the same as a flange and bottle does with a traditional pump. Willow Wave Collection Cups give you the freedom to pump more discretely without compromise. The Cups connect seamlessly to 20 different traditional desktop pumps to transform the pump you already own into a hands-free experience. They also connect to the Willow Wave handle for a wearable (single or double) manual pumping option. Just follow the assembly instructions––and don't forget the Diaphragm Assembly when connecting to your traditional electric pump!

Yes! It helps to know how an open system works. For best practices and tips, read this blog post.

Ameda Mya Joy, Ardo Calypso, Baby Buddha, Dr. Brown’s Double Electric, Elvie Stride, Evenflo Advanced, Lansinoh Signature, Medela Freestyle, Medela Pump in Style, Medela Swing Maxi, Motif Duo, Motif Luna, Motif Twist, Phillips Avent Single Electric, Pumpable Genie Advanced Portable Pump, Spectra S1, Spectra S2, Spectra S9+, Spectra Synergy Gold, Zomee Z2.

An electric pump is not included, but here is the list of compatible pumps. The Willow Wave manual pump handle is included for a single or double wearable manual pump option.

Yes, our silicone sizing inserts help to optimize output for moms who measure between 13mm and 27mm.

The Collection Cup is top-rack dishwasher safe. Tubing, Handle, Diaphragm Assembly, and Tubing Adaptors can be wiped down with a damp cloth.

Wave containers can hold up to 5 oz.

Yes, you can. Simply pay for your breast pump and accessories using your FSA/HSA debit card at checkout, or pay with another credit card and submit your receipt to your plan administrator for reimbursement.

Yes! Wave is covered under a 90-day warranty from the purchase date. Accessories (all replaceable pump parts including but not limited to flange, container, gasket, valve) are also covered under a 90-day warranty. Please review our warranty policy.

Since breast pumps are single-user devices, use by more than one person, including purchasing second hand, will invalidate the warranty. Please keep your original proof of purchase from onewillow.com or an authorized retailer as it is required to exercise your warranty.

Wave has two modes: Stimulation and expression, which is controlled by a switch on the handle. Slide the teal switch up for stimulation to trigger a letdown. Slide down for expression and continuous milk flow.

If your Willow Wave Collection Cups leaks milk, consult the Quick Start Guide that came with your pump or instructions for use to ensure that the cup has been assembled firmly and correctly. If you continue to experience an issue, contact Willow’s customer care team at 1-888-WILLOW-3.

First review the Quick Start Guide and Instructions For Use that came with your pump to ensure that the cup and tubing have been assembled firmly and correctly. If you continue to experience an issue, contact Willow’s customer care team at 1-888-WILLOW-3.

If the tubing becomes contaminated with milk or water, you can contact our customer care team here.

Manual pumping is meant to alleviate pain and discomfort, or to gently induce letdown before or after nursing sessions. It is not often used as a primary pump. Depending on your goal, your pumping sessions will vary according to your unique needs.

Willow Wave 2-in-1 Double Manual Wearable Pump + Collection Cups is the first and only wearable, fully in-bra, double manual pump designed to give moms the discretion, comfort, and convenience they deserve. It’s engineered with an ergonomic handle to reduce wrist discomfort and hand cramping, and is made with a soft, silicone, 24mm flange for a smooth fit and optimal milk output.